红壤旱地不同种植模式下NPK养分动态平衡分析

Nutrient Dynamic and Balance of Different Farming Patterns in Red Soil Upland

通过对红壤旱地连续7年定位监测研究,旱地不同种植模式养分平衡存在一定差异:养分循环速率以施用有机肥的花生-绿肥-花生模式为最高,元素的养分循环速率为N>K>P;整个旱地种植系统的N、P、K养分均出现积累,以P的累积量最大;施用的肥料中N、P、K配比不合理,元素P量过多,可以适当减少;各模式中N、P、K元素平衡点均高于对应的养分允许盈余值,肥料投入过多。

A long fertilization experiment has been conducted on red soil upland for 7 years. The results showed that the nutrient dynamic and balance of different planting patterns in red soil upland were different. Nutrient circulation speed of pattern 1 （peanut-green manure-peanut with organic fertilizer） was the highest, and the nutrient circulation speed order of element was N〉K〉P. In the system the accumulation of P is the biggest and element P is excessive. Hence, the NPK allocated proportion of fertilizers were unreasonable and P should be reduced to some extent.